Question

I have a query where I need to have ordeby based on a querystring parameter .For example if sortby parameter is price , Query needs to change with price . If its rating than change query to sort by rating .

I know PredicateBuilder can do And and OR stuff but how do I make a dynamic ordeby linq query .

Answer 1

Well, you could use a switch statement or something similar:

IQueryable<Foo> query = ...;

switch (orderByParameter)
{
    case "price":
        query = query.OrderBy(x => x.Price);
        break;
    case "rating":
        query = query.OrderBy(x => x.Rating);
        break;
    // etc
}

You could also do it with reflection, but assuming you have a limited number of fields to order by, this is quite possibly the simplest approach.